Monarch Disease Ontology entry MONDO_0003222 (central nervous system melanocytic neoplasm) is a primary tumor of the central nervous system that arises from leptomeningeal melanocytes. It may present as a diffuse proliferative leptomeningeal process (often as a component of the neurocutaneous melanosis complex) or as a distinct mass lesion. Also known as: CNS melanocytic neoplasm, CNS melanocytic tumor, CNS melanocytic tumour, central nervous system melanocytic neoplasms, central nervous system melanocytic tumor, central nervous system melanocytic tumour, melanocytic neoplasm of CNS, melanocytic neoplasm of central nervous system.